---
title: GoodFET22
---
<h1>GoodFET22</h1>

<p>The GoodFET22 is the seventh hardware revision of the GoodFET,
owing its heritage to the <a href="/hardware/badfet20/">BadFET20</a>
and <a href="/hardware/goodfet30/">GoodFET30</a>.  It retains the more
powerful MCU of the BadFET20 while adopting the GoodFET30's smaller
board and lack of crystals.  The 74HC4053 MUX has been dropped from
the design, and glitching is now performed through
an <a href="http://www.analog.com/en/switchesmultiplexers/analog-switches/adg1634/products/product.html">ADG1634</a>
from Analog Devices.
</p>

<h2>CAD Files</h2>

<p>Eagle CAD 5.x files for the design can be found in
/branches/goodfet22 of the subversion repository, or as
<a href="/releases/goodfet22.zip">goodfet22.zip</a>.</p>

<h2>Bill of Materials</h2>

<p>The ADG1634BRUZ is optional and only useful for voltage glitching
research.  If omitting it, populate the two empty resistor pads near
it with zero-ohm resistors.</p>

<table border="1">
<tr><td>Quantity</td><td>Package</td><td></td></tr>
<tr><td>1</td><td>SSOP28</td><td><a href="http://www.ftdichip.com/Products/FT232R.htm">FT232RL</a></td></tr>
<tr><td>1</td><td>QFP64</td><td><a href="http://focus.ti.com/docs/prod/folders/print/msp430f2618.html">MSP430F2618TPM</a></td></tr>
<tr><td>1</td><td>TSSOP20</td><td><a href="http://www.analog.com/en/switchesmultiplexers/analog-switches/adg1634/products/product.html">ADG1634BRUZ</a></td></tr>
<tr><td>3</td><td>0603</td><td>0.1&mu;F Decoupling Capacitors</td></tr>
<tr><td>3</td><td>0603</td><td>0603 LED</td></tr>
<tr><td>2</td><td>0603</td><td>330R LED Series Resistors</td></tr>
<tr><td>1</td><td>0603</td><td>47K !RST Pull-up Resistor</td></tr>
</table>

<p>Resistor values can be approximated.  Be sure to get the 64 pin
variant of the MSP430F2618.</p>

<h2>Construction</h2>

<a href="http://www.flickr.com/photos/travisgoodspeed/4307787292/"
title="GoodFET22 by Travis Goodspeed, on
Flickr"><img src="http://farm5.static.flickr.com/4020/4307787292_381d9301d8.jpg"
width="500" height="180" alt="GoodFET22" /></a>

<a href="http://www.flickr.com/photos/travisgoodspeed/4351528769/"
title="GoodFET22 Schematic by Travis Goodspeed, on
Flickr"><img src="http://farm5.static.flickr.com/4023/4351528769_0ddb6a1f31.jpg"
width="500" height="286" alt="GoodFET22 Schematic" /></a>

<h2>Errata</h2>

<p>The board's silkscreen lists the chip as an ADG1633.  Use a 1634,
as the 1633 is a related chip that will not fit.</p>

